Automatic hammer.



No. 729,666. y PMBNTBD JUNE 2, 1903.

- 0. B. ROBERTS.

` AUTUMATIG HAMMER.

APPLIOA'JHH` PILEDJUNE 19, 1901.

R0 MODEL. 2 SHEETSSHEET 1.

PATBNTBD JUNE 2, 1903. o. B. ROBERTS.- AUTOMATIC HAMMER.

APPLIOA'ICION FILED JUNE 19, 1901.

2 SHEETS-SHEET 2.

NQ MODEL.

UNITED STATES Patented June 2, 1903.`

PATENT OEETCE,

ODINR. ROBERTS, OE DEDHAM, MASS-ACTTUS'ETTS, ASSIGNOR TOA'UTOMATICHAMMER COMPANY, OE BOSTON, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

AUTOMATIC HAMMER.

SPECIFICATION forming part of Letters Patent'No. 729,666, dated une 2,1903.

Application iiled June 1x9, 1901i.

To all whom 13 may concern:

Beit known that I, ODIN B. ROBERTS, a citizen of the United States, anda residentl of' Dedham, in the county of Norfolk and State ofMassachusetts, have invented new' and useful Improvements in AutomaticHammers, of which the following is a specification.

My invention relates to automatic tacking-` tools of which theshoe-lasting hammers de xo scribed in United States Letters Patent Nos.

620,650, 670,403, 670,496, issued March '7, 1899, `March 19, 1901, March26, 1901, respectivey, to Arsene I-Iebert are types and has to doespecially with the mechanism for presentx5 ing tacks successively tothe acting face of the tack-driver. Tools of this character c0111-,prise a tack receptacle or hopper which auto' matically arranges thetacks in a row on a raceway and tack-separating mechanism which zoremoves the tacks one by'one from the row in the raceway and deliversthem to the tackchannel, wherein they pass to the tack-drivingmechanism. The tack gathering and separating mechanism of the Heberttools described in the aforesaid patents will serve to assist inillustrating my invention, which I show herein as applied to a tool ofthis char-p` acter. The tack gathering and separating mechanism istherefore not shown in detaill 3o herein, and I leave it to beunderstood that suitable tack gathering and separating mechanism, suchas that devised by AtrseneHe-i` bert, is a part of the organizedmechanism of the tool about to be described. Y

In the drawings hereto annexed, which illustrate an embodiment of myinvention, Figure 1 is a vertical longitudinal section of part of alasting-hammer, showing the working parts of the tack-driving mechanismand 4o devices associated therewith. Fig. 2 is a front view of the hammer-head; Fig. 3, a vertical longitudinal section of the lower end ofthe hammer-head, showing a modified form of the mechanism .forpresenting a tack to the driver. Fig. 4 is a detail showing inperspective the tack-check which forms part of the mechanism of Fig. 1,and Fig. 5 is a detail showingthe tack-plunger in perspective.

A is the hammer-handle, to which the op- Serial No. 65,164. (No model.)

` erative parts of the tool are secured or on which theyare mounted.

Brepreseiits roughly a tack-separator such as that shown in the Hebertpatents aforesaid.

O is the actuating-lever for the tack-separator, and ,I the detent,controlled by theA finger ot' the person handling the tool.

The parts just mentioned are only indicated herein, as a fulldescription of them and their functions may be found in the Hebertpatents.

T is a cylindrical stud which serves as a sliding bearing for thehammer-head, a housing for the spring which normally controls thehammer-head, and as a part of the channel "through which tacks descendone by one tothe hammerfhead.- as they are separated from thesupply-raceway and dropped by the separatorsubstantiallyas shown in thesaid Hebert patents.

The stud T, which is screwed or otherwise lirmly attached to the'h'andleA, has an inner tube T', between which and the outer shell is a spacefor the reception of the spring t'. The shell of the stud T is enlarged,so as to `form a iiange or shoulder t at its lower end.

The hammer-head H is for convenience of manufacture made in threedivisions, the

'upper division I-I being bored out at 7L to receive the stud T. Themiddle division H2 has an outer screw-threaded sleeve h2, which screwsinto a cavity formed for the purpose in the bottom of the division H',and an inner sleeve h, which serves as a bearing for the springt', whichseats on the top of the sleeve h6, and as a continuation of thetackchannel at T3. The shoulder t on the stud T slides in the spacebetween the inner and outer sleeves It? and 71,2. H3 of the hammer-headscrews into the bottom of the middle section H2 and contains thetack-check, tack-plunger, and tack-stop. The lower end of thetack-channelrTsiisinclined from the perpendicular and passes di agonallyfrom the middlesection H2 through the lower section H3, leading to thetack-receiving chamber and the driver-passage d.

The tack-driver shown in the Hebert pat- The lower section ents is thereshown as forming part of the stud or housing, which is here representedat T, and might be so constructed in the tool here described withoutsubstantial change in the combinations which embody my invention; butpartly for convenience in manufacture and partlyto provide foradjustability in effective length ofthe tack-driver I show the driverhere as separate from the stud T and working in its own slide or passagein the hammer-head H.

The driver D is a cylindrical spindle screwed to the handle A at D',provided with a set-nut D2 and a polygonal-faced section at Dwherebyitmay be adjusted with a wrench. The driver-passage cl is bored straightthrough all three sections of the hammerhead H. As the person handlingthe hammer strikes a blow therewith the hammerhead H slides toward'thehandle A, compressing the springt', and the driverD forces a tackpreviously lodged in the lower end of the driver-passage into/thematerial struck. When the hammer is again lifted, the spring t pushesthe head H to its normal position, as shown in Fig. 1, and the lowerendof the driver-passage is ready toreceive another tack.

The tack separating mechanism B is so connected with the movable partsof the tool that it drops a tack into the tack-channel when the springt' forces the hammer-head to its extended position. The tack fallsthrough the channels T2 and Tgand is arrested by the check G.

The cheek G (seen in detail in Fig. 4) is a reciprocating plunger,forked at its inner end at g', cut away on its lowerside at g, andcounterbored at g2, so that the point of the tack falls between thefork-prongs g and rests with its head in the counterbore g2. The check Gis secured at its outer end to the spring G, which'is fastened to theblock G2 on the hammer-head H. This spring G' is cramped, so as to pressthe check inward constantly. An inclined block G3 is secured to thespring G and lies in the path of the trip E3, which is hinged at E4 tothe arm E2, which is part of the cam-block E, fast to the handle A atE'. The toe of the trip E3 slides in the groove e, cut in the front ofthe hammer-head H. Below the check G lies the tack-plunger P, whose headP slides in the tack-receiving chamber K. This chamber K is open to thelower part of the driver-passage d.

The outer end of the plunger P is jointed to the lever P2. This lever ispivoted at P3 in the block G2 and has the cam-follower l5'4 secured toits upper end. The cam-groove P5, cut in the cam-'block E, is soproportioned that as the head H moves up and down the plunger P isreciprocated and its head P' alternately approaches and recedes from thedriver-passage cl, closing and opening the lower end of the tackchannelin so doing.

A tack is supposed to have fallen on the forked check G. The point ofthis tack lies in the groove p, cut for the purpose in the plunger-headP', Fig. 5. A blow is struck with the tool, and the head H slides up tothe handle A. As it does so, irst the plungerhead P' is drawn to theback of the tack-receiving chamber, leaving the tack-channel open at thebottom, except for the check G. Next the trip E2 strikes the beveledblock G3 and moves the tack-'check outwardly, letting the tack drop-into the tack-receiving chamber between the face of the plungerhead Pand the side of the driver D, which has descended into the lower part ofthe driver-passage d. When the trip E3 passes the block G3, the spring Gsnaps the check G back into place above the tack, which is thusimprisoned in the tack-receiving chamber K. When the tool is lifted fromthe work, the springt asserts itself, and the hammerhead H -is extended.The trip E3 rides over the block G3, being hinged at E4, and its springE5 returns it to place for the next stroke. Thedriver D as'cends in thehammer-head and the cam P5 causes the plungerhead P to move toward thedriver-passage (l, pushing the tack into the driver-passage and closingthe door (so to speak) behind it. The spring-stop S, pivoted in the sloth5 at s', forked ats and under the control of the spring s', keeps thetack in the driver-passage until the next descent of the driver forcesthe stop S to one side and the tack into the work. Meanwhile anothertack has dropped on the check G and the tool is ready for anotherexeursion.

The check G is employed for the sake of extra precaution against a tackjumping back out of the receiving-chamber K; but with intelligenthandling the tool will work accurately without the check G. In such casethe lower end ot the hammer-head may be constructed as shown in Fig. 3,where the plunger-head P lies directly across the lower end of thetack-channel T3.

The groove p in the plunger-head in this construction is proportioned sothat a tack lies with its head resting on the top of the plunger-headand its point in the notch. The functions of the plunger are the same asin the construction described at length above. V

If it is desired to drive tacks only part way, so that they may beextracted from the work easily, the driver D is lowered farther into thesocket at D and the set-nut D2 secures it in place. The top section H'of the hammerhead is counterbored at el' to admit the setnut D2. Whenthe three parts of the head H are screwed together, binding-screws h4,Fig. 1, and m, Fig. 2, serve to lock them in place.

What I claim, and desire to secure by Letters Patent, is-

1. In a tool of the character described, the combination of a handle, ahammer-head slidingly mounted thereon, a tack-driver, a pas- IIO sagetherefor in the hammer-head, a tack-receiving chamber beside the lowerend of the driver -passage and open thereto, a tackchannel leading tothe tack-receiving chamber, a plunger in the receiving chamber, movabletherein toward and from the driverpassage, and plunger-actuatingmechanism connected to the plunger, whereby it is reciprocated in thetack-receiving chamber across the end of the tack-channel at eachexcursion of the hammer-head.

2. In a tool of the character described the combination of a handle, ahammer-head slidingly mounted thereon, a tack-driver, stationary withrelation to the handle, a driverpassage in the hammer-head, atack-receiving chamber in the hammer-head beside the lower end of thedriver-passage, and open thereto, a tack-channel leading to the receiving-chamber,a plunger in the receiving-chamber movable toward and from thedriver-passage and mechanism connected with the plu nger whereby, whenthe hammer-head slides away from the handle, the plunger is moved towardthe driver-passage and across the tack-channel, and vice versa when thehammer-'head slides toward the handle.

3. In a tool of the character described the combination of a handle, ahammer-head slidingly mounted thereon, a tack-driver, a passage thereforin the hammer-head, a tack-receiving chamber beside the lower end of thedriverpassage and open thereto, a tackchannel leading to thetack-receiving chamber, a plunger reciprocally movable therein towardand from the driver-passage, a tackcheck lying` across the tack-passageabove the plunger, and actuating mechanism for the plunger andtack-check,whereby they are vibrated across lthe end of the tack-channelat eachexcursion of the hammer, substantially as described.

4. In a tool of the character described, the combination of a handle, ahammer-head slidingly mounted thereon, a tack-driver, its passage in thehammer-head, a tack-receiving chamber, a tack-channel, a plunger, itsoperatinglever aud cam, a tackcheck, its spring, a tack-check trip, aprojection on the check spring actuated by the trip, and aspring-controlled tack-stop in the lower end of the driver-passage,substantially as described.

5. In a tool of the character described, the combination of a handle, ahammer-head slidingly mounted thereon, a tack-driver, its passage in thehammer-head, a tack-receiving chamber, a tack-channel, a plunger, itsoperatinglever and cam, a tack check, its spring, a hinged tack-checktrip, a projection on the check-spring actuated by the trip, and aspring-controlled tack-stop in the lower end of the driver-passage,substantially as described.

Signed by me at Boston, Massachusetts, this 13th day of June, 1901.

ODIN B. ROBERTS.

Witnesses: t

Ero GRoLL, FRANK S. HARTNETT.

